Original Gopher by Rene French and drawn here by Ashley Mc Namara
GO-100 is a directed tour of the language, see Go tour. The purpose of this first course is to learn the basics of the language to be able to build simple application.
The GO-100 slides are available here.
GO-200 will guide you through the building of a standard REST web service as a CRUD API using for a todolist. You will learn how to process command line arguments, setup persistence and expose HTTP endpoints.
The GO-200 slides are available here.